Web doffing device for carding machines, with blades or wires moving in planes tangent to the doffer



Oct. 10 1967 c. DEGLI ANTONI 3,345,6598

WEB DOFFING DEVICE FOR CARDING MACHINES, WITH BLADES OR IRES MOVING IN PLANES TANGENT TO THE DOFFER 964 2 Sheets-Sheet 1 Filed Dec. 4, l

INVENTOR ATTORNEYS Oct. 10 1967 c. DEGLI ANTON! 3,345,698

WEB DOFFING DEVICE FOR CARDING MACHINES, WITH BLADES on WIRES MOVING IN PLANES TANGENT TO THE DOFFER Filed Dec. 4, 1964 2 Sheets-Sheet 2 mar in INVENTOR ATTORNEYS United States Patent ABSTRACT OF THE DISCLOSURE A web dofiing device for carding machines, comprising a dolier comb, supports for the comb and means for reciprocating the comb in a plane which is substantially tangent to the doffing drum.

It is known that web dofiing combs for carding machines are actuated through pivotally mounted arms that cause the comb to cover an arc of a circle, corresponding to a given angle; therefore the tangential coincidence of the dofiing drum periphery with the web dofiing comb is situated at the point of tangency of the two curves; that of the dofiing drum periphery, and the curved path covered by the comb. As a result, the horizontal strip of web stripped at each stroke of the comb, cannot exceed a certain height, due to the curved excursion of the comb; moreover, since the blade is offset in its practically horizontal working position, the frequency of oscillation cannot exceed a certain insurmountable limit, as otherwise there occur breakages of the supports of the blade and of the blade itself.

The present invention relates to a web dofling device for carding machines, with blades or wires moving in planes tangential to the dolr'er.

More exactly, it is an object of the invention to provide a web dofling device for carding machines characterized by the fact that it includes one or more blades, or one or more wires, moving in planes almost tangential to the dofling cylinder, and, if more than one, parallel to each other.

This new web dofiing device offers, in respect tothose already known, remarkable advantages, such as an increase in the working speed and the better exploitation of the stroke of the one or more blades, or of the one or more wires.

In particular, in case wires are employed, there are obtained the additional advantages of an increase in the theoretical stroke (thanks to the wire elasticity) and of a reduction practically to zero of the inertial masses, which allows an additional increase of the working speed.

The attached drawings represent diagrammatically, in the way of nonlirniting example, some forms of embodiment of the present invention, and namely:

FIGURE 1 is a perspective view of a form of embodiment of the device being the object of the invention.

FIGURE 2 represents in a perspective view another form of embodiment of the device object of the invention.

FIGURE 3 is a sectional view of a supporting and guiding arrangement for the blades of FIGURE 2.

FIGURE 4 represents a sectional view of a constructive detail of the device of FIGURE 8. 0

3,345,698 Patented Oct. 10, 1967 FIGURE 5 shows a perspective view of another form of embodiment of the present invention.

FIGURE 6 is a plan view of a constructive detail of the device in FIGURE 5.

FIGURE 7 is a constructive scheme concerning FIG- URES 1, 2. and 5.

FIGURE 8 is a perspective view of another form of embodiment of the device object of the present invention.

Referring in particular to FIGURE 1, it can be seen that the device, object of the present invention, includes a blade 5, vertically supported by a plurality of arms 6 which are slidably guided within the stationary sleeves 7, and terminate at their upper ends in forks 6 which are pivotally connected to the lower end of the connecting rods 8 and the other ends of pins 8 are pivotally connected to crankpins 9 of the crankshaft 10, which is practically situated in the same vertical plane as the arms 6 and the blade 5. This blade 5 is contained, and is apt to move with a vertically reciprocating motion, in a plane that is tangent to the periphery of the clotting cylinder 11, whichrotates in the direction of the arrow F, and from which the web 12 has to be stripped.

The device includes further a blade- 13, parallel to the blade 5, supported by arms 14, guided within the stationary sleeves 15 and actuated, as the preceding ones, by connecting rods 16, mounted on as many crankpins 17, diametrically opposite to the crankpins 9.

The blades 5 and 13 are therefore moving parallelly with reciprocating motion of opposite direction.

According to another form of embodiment of the device, object of the present invention, not shown in the figures, and having the purpose of improving the lubrication of the actuating members, the assembly connecting rods-crankpins described above, which drives the blades 5 and 13, is placed below rather than above the blades themselves, while the rotation of the drum is reversed.

In this way it is possible to have the crankshaft 10, the crankpins 9 and 17, and the lower ends of the connecting rods 8 and 16, all working in an oil bath, enclosing the whole in a crankcase.

FIGURE 2 represents another from of embodiment of the present invention.

From said FIGURE 2, it can be seen that both blades respectively marked 5 and 13 are actuated through two lateral connecting rod and crankpin drives, connected by 'a shaft 20. More exactly, the blade 5 is carried by the connecting rods 6 and 6', placed in correspondence of its lateral ends while the blade 13 is carried by the connecting rods 14 and 14', also placed in correspondence of its lateral ends. The connecting rods 6 and 14 are pivotally mounted on the crankpins of the chankshaft 10. In the figure can be seen a crankpin 9, on which is pivotally mounted the connecting rod 14. The crankshaft 10 is connected, through a shaft 20, with a corresponding crankshaft, nonvisible in the figure, driving the connecting rods 6' and 14, and arranged in correspondence of the other end of the blades 5 and 13. The crankshaft 10, the crankpins carried by same, as well as the lower portion of the connecting rods 6 and 14 are enclosed in a crankcase 21 and work in an oil bath. Similarly, at the other end of the drum 11, the lower ends of the connecting rods 6' and 14, the crankpins on which they are pivoted, and the corresponding crankshaft are contained in a crankcase 21', and they also work in an oil bath.

The connecting rods 6, 6 are pivotally mounted on crankpins that are diametrically opposite to those carrying the connecting rods 14 and 14, so that the reciprocating movements of the blades and 13 are of opposite direction.

When, as shown in FIGURE 2, the blades are supported on lateral drives, they may have a tendency to vibrate and also to bend both in a horizontal direction and although to a lesser degree in a vertical direction. In order to prevent this inconvenience, the present invention foresees the guiding device for the blades shown in FIGURE 3. As it can be seen from said figure, the first comb carrying blade 30, terminating with the web dofiing comb 31, is carried by means of a small bracket 32 on a sliding rod 33. Said rod 33 slides within two coaxial ball bushings marked 34 and 35, inserted in a guiding member 36. This guiding member is secured to a supporting bar 37 which is supported on the sides of the dofiing cylinder 11.

The second comb carrying blade 40', provided with the web doffing comb 41, is connected by means of a bracket 42 to the sliding rod 43, supported by the supporting bar 37, in a way exactly similar as the rod 33. Obviously, each blade 30 and, respectively, 40 is guided by a plurality of devices of the type just described. In FIGURE 3 there is also represented an air deflecting baffie marked 50. Said air deflecting bafile 50, the length whereof is equal to that of the doifing drum .11 has a curvature opposite to that of the drum and has its lower edge 51 adjacent to the edge of the first web doffing comb 31.

Referring now to FIGURE 8, the present invention foresees, as a variant to FIGURE 2, that in place of the blades 5 and 13, the connecting rods 6, 6' and 14, 14' carry respectively the wires 3 and 2, secured to the connecting rods according to another possible arrangement.

The connection of each of the wires 3 and 2 to the arms 6-, 6' and 14, 14', respectively, may be fixed and adjustable by means of a handwheel, in a way similar to what happens for the strings of musical instruments, and/or may be movable, according to various forms of limiting example in FIGURE 4.

From this FIGURE 4 it can be seen that the end 2 of the wire 2 is anchored in a member 23, carried by a cylindrical helical spring 24, the axis whereof practically coincides with the wire, and which is contained in a hollow cylindrical member 25, secured to the connecting rod 4 and permndicular to same; said retrieving spring 24 can be more or less compressed by screwing in or out within the threaded cavity 27 of said member a threaded plug 26.

Each of the wires 2 and 3 can meet with its central portion a trough-shaped element 30', preferably made of plastic material, secured at its end by whatever means to the drum frame, that facilitates the maintenance of the movement of the wire itself, in a vertical plane.

According to another form of embodiment shown in the FIGURES 5 and 6, the wires 2' and 3' tangent to the drum 11', are supported at their ends by the pivots 31, 31' and respectively 32, 32', the pivots 31 and 32 being part of the cranks 33 and 34 of the crankshaft 35, and the pivots 31 and 32' forming part of the cranks 33' and 34' of the crankshaft 35'. On the crankshafts 35 and 35' there are keyed respectively pulleys or gears 36 and 36, driven through belts 37, or gears respectively. Said crankshafts are perpendicular to the drum axis.

In FIGURE 5 there are represented for sake of simplicity two wires marked 2' and 3; according to the present invention however there is foreseen the use of any desired number of single or combined wires, or blades.

With further reference to FIGURE 1, the present invention foresees alternatively that the blades 5 and 13 be substituted by wires similar to those cited above, with reference to the FIGURES 5, 7 and 8.

In FIGURE 7 there are diagrammatically shown, in the way of a nonlimiting example, several possible arrangements of said wires, respectively with single wires (2, 3) with wires combined in pairs (40, 40 and 41, 41), with terns of wires (42, 42, 42" and 43, 43', 43") and finally with a single wire (45), combined with a pair of wires (46, 46') and with a tern of wires (47, 47, 47"). The wires may be of steel, nylon, or any other material. They may have any whatever cross-section, for instance circular, triangular, toothed, etc., or may be spirally wound.

Other expedients may be adopted, besides those described, to improve the web dofling device according to the invention, without therefore departing from the protective range of the present invention.

In particular, the single ,or several blades or the single or several wires constituting the device may be foreseen movablein planes not only vertical but also horizontal, or having any whatever inclination, always tangential to the drum.

I claim:

1. Web doffing device for carding machines which have a doffing drum and a doffer comb, supports for said comb and means for reciprocating said comb in a plane which is substantially tangent to said doffing drum, wherein the supports for said comb are in the form of straight rods, fixed bearings, ball bearings for said rods, each rod being slidably mounted with respect to said fixed bearings and said ball bearings mounted between each rod and its fixed bearings.

2. Web dofiing device as claimed in claim 1, wherein there is provided an air deflecting baffle, of length equal at least approximately to that of said drum and cylindrically curved so as to be convex on the side facing said drum, the working edge of said baffle being parallel to the drum axis, adjacent to said drum and to the said reciprocating comb, and the distance between said baffle and drum increasing according to the rotation direction of said drum.

3. Web dofiing device for carding machines which have a dofiing drum and a doffer comb, supports for said comb and means for reciprocating said comb in a plane which is substantially tangent to said doffing drum, wherein said comb is in the form of one wire connected at its ends to said supports.

4. Web doffing device as claimed in claim 3, and comprising means mounted on a support for tensioning said wire.

5. Web doffing device as claimed in claim 4, wherein said tensioning means comprises a spring.

6. Web doffing device as claimed in claim 5 and comprising screw means for adjusting the tension of said spring.

7. Web doffing device for carding machines which have a dofiing drum and a doifer comb, supports for said comb and means for reciprocating said comb in a plane which is substantially tangent to said dofiing drum, wherein said comb is in the form of several wires.

8. Web doffing device as claimed in claim 7, comprising a multicomb in the form of a pair of wires mounted on common supports.

9. Web doifing device as claimed in claim 7 comprising two multicombs in the form of six wires arranged in two groups of three each.

10. Web doffing device as claimed in claim 7, comprising three multicombs in the form of six wires arranged in groups of three, two and one wires.

11. Web dofling device for carding machines which have a dofiing drum and a dofier comb, supports for said comb and means for reciprocating said comb in a plane which is substantially tangent to said dofilng drum, wherein there is provided a trough shaped control member located on the side of said comb opposite its supports and at the end of the reciprocation stroke of said comb, against which control member said comb strikes once during Y each reciprocation.

5 6 12. Web doffing device for carding machines which FOREIGN PATENTS have a dofiing drum and two dofier combs, supports for 680 008 8/1939. Germany said combs and means for reciprocating said combs 180 948,041 8/1956 Germany out of phase one with the other in planes which are sub- 3/1862 Great Britain stantially tangent to said dofiing drum, wherein the sup 5 1 953 7/1862 Great Britain ports for said combs are in the form of straight rods, fixed 48/18 Great Britain bearings, ball bearings for said rods, each rod being 2032 6/1868 Great Britain. slidably mounted with respect to said fixed bearings and 2810 12/1853 Great Britain said ball bearings mounted between each rod and its fixed 751965 7/1956; Great Britain bearings.

10 References (flied MERVIN STEIN, Primary Examiner. UNITED STATES PATENTS I. c. WADDEY, Assistant Examiner.

2,278,611 4/1942 Cavedon 19-106 

1. WEB DOFFING DEVICE FOR CARDING MACHINES WHICH HAVE A DOFFING DRUM AND A DOFFER COMB, SUPPORTS FOR SAID COMB AND MEANS FOR RECIPROCATING SAID COMB IN A PLANE WHICH IS SUBSTANTIALLY TANGENT TO SAID DOFFING DRUM, WHEREIN THE SUPPORTS FOR SAID COMB ARE IN THE FORM OF STRAIGHT RODS, FIXED BEARINGS, BALL BEARINGS FOR SAID RODS, EACH ROD BEING SLIDABLY MOUNTED WITH RESPECT TO SAID FIXED BEARINGS AND SAID BALL BEARINGS MOUNTED BETWEEN EACH ROD AND ITS FIXED BEARINGS. 